In der .tex-Datei:

\cite{ABB}  % ABB ist der sog. Zitationsschlüssel

\bibliographystyle{BIBSTILNAME} % Datei BIBSTILNAME.bst
\bibliography{BIBNAME}          % Datei BIBNAME.bib

Bei mehreren bib-Dateien:
\bibliography{BIBNAME1,BIBNAME2} %! kein Leerzeichen zwischen den Namen

###########################################################

In der .bib-Datei:

(für URL: \url{http://...} in z.B. note (techreport) oder howpublished (misc))

@comment{	Zeitungs- oder Zeitschriftenartikel}
@article{ABB,
	author = {Shen Lin and Brian W. Kernigha},
	title = {An Effective Heuristic Algorithm for the Travelling-Salesman Problem},
	journal = {Operations Research},
	year = {1973},
	
	volume = {21},
	number = {},
	pages = {},
	month = {},
	note = {}
}

@comment {BEISPIEL 
@article{lin1973,
	author = "Shen Lin and Brian W. Kernighan",
	title = "An Effective Heuristic Algorithm for the Travelling-Salesman Problem",
	journal = "Operations Research",
	volume = 21,
	year = 1973,
	pages = "498-516"
}}

@comment{	Buch}
@book{ABB,	
	author / editor = {} ,
	title = {}, 
	publisher = {}, 
	year = {}, 	
	
	volume / number = {}, 
	series = {}, 
	address = {}, 
	edition = {}, 
	month = {}, 
	note = {}, 
	isbn = {}
}

@comment{	Gebundenes Druckwerk}
@booklet{ABB,
	title = {} ,
	
	author = {} ,
	howpublished = {} ,
	address = {} ,
	month = {} ,
	year = {} ,
	note = {} 
}

@comment{	Wissenschaftliche Konferenz}
@conference{ABB,
	author = {} ,
	title = {} ,
	booktitle = {} ,
	year = {} ,
	
	editor = {} ,
	volume / number = {} ,
	series = {} ,
	pages = {} ,
	address = {} ,
	month = {} ,
	organization = {} ,
	publisher = {} ,
	note = {}
}

@comment{	Teil eines Buches; chapter und/oder pages}
@inbook{ABB,
	author / editor = {} ,
	title = {} ,
	booktitle = {} ,
	chapter = {} ,
	pages = {} ,
	publisher = {} ,
	year = {} ,
	
	volume / number = {} ,
	series = {} ,
	type = {} ,
	address = {} ,
	edition = {} ,
	month = {} ,
	note = {}
}

@comment{	Teil eines Buches (z. B. Aufsatz in einem Sammelband) mit einem eigenen Titel}
@incollection{ABB,
	author = {} ,
	title = {} ,
	booktitle = {} ,
	publisher = {} ,
	year = {} ,
	
	editor = {} ,
	volume / number = {} ,
	series = {} ,
	type = {} ,
	chapter = {} ,
	pages = {} ,
	address = {} ,
	edition = {} ,
	month = {} ,
	note = {}
}

@comment{	Artikel in einem Konferenzbericht}
@inproceedings{ABB,
	author = {} ,
	title = {} ,
	booktitle = {} ,
	year = {} ,
	
	editor = {} ,
	volume / number = {} ,
	series = {} ,
	pages = {} ,
	address = {} ,
	month = {} ,
	organization = {} ,
	publisher = {} ,
	note = {}
}

@comment{Technische Dokumentation}
@manual{ABB,
	address = {} ,
	title = {} ,
	year = {} ,
	
	author = {} ,
	organization = {} ,
	edition = {} ,
	month = {} ,
	note = {}
}

@comment{Diplom-, Magister- oder andere Abschlussarbeit (außer Promotion)}
@mastersthesis{ABB,
	author = {} ,
	title = {} ,
	school = {} ,
	year = {} ,
	
	type = {} ,
	address = {} ,
	month = {} ,
	note = {}
}

@comment{beliebiger Eintrag (wenn nichts anderes passt)}
@misc{ABB,

	author = {} ,
	title = {} ,
	howpublished = {} ,
	month = {} ,
	year = {} ,
	note = {}
}

@comment{Doktor- oder andere Promotionsarbeit}
@phdthesis{ABB,
	author = {} ,
	title = {} ,
	school = {} ,
	year = {} ,
	
	type = {} ,
	address = {} ,
	month = {} ,
	note = {}
}

@comment{Konferenzbericht}
@proceedings{ABB,
	title = {} ,
	year = {} ,
	
	editor = {} ,
	volume / number = {} ,
	series = {} ,
	address = {} ,
	month = {} ,
	organization = {} ,
	publisher = {} ,
	note = {}
}

@comment{veröffentlichter Bericht einer Hochschule oder anderen Institution}
@techreport{ABB,
	author = {} ,
	title = {} ,
	institution = {} ,
	year = {} ,
	
	type = {} ,
	note = {} ,
	number = {} ,
	address = {} ,
	month = {}
}

@comment{nicht formell veröffentlichtes Dokument}
@unpublished{ABB,
	author = {} ,
	title = {} ,
	note = {} ,
	
	month = {} ,
	year = {}
}